Due to the geometrical asymmetry, the beam response includes a component out of the \(y\) -plane. We compute the twist at the tip of the beam as a measure for this deformation. fig:3Dfft shows the frequency response thereof, as computed with a fast Fourier transform of the data from the first 0.01 seconds, windowed with a Blackman window [1]}. fig:3DfftP1 shows the results for the computation with linear basis functions on the coarse mesh. The \(c=5000\)  case has been removed from the plot to avoid clutter and since it produces a largely inaccurate spectrum due to the artificial damping.
fig:3DfftP2 shows the results for the computation with quadratic basis functions on the coarse mesh, which again results in a considerable improvement in the reproduction of the reference spectrum. For both computations, we observe that the scaled mass only marginally affects the system response. The locations and magnitudes of the peaks are not affected, and the changes in magnitudes are minor. For the linear basis functions, the overpredicted magnitude of one of the dominant peaks is even reduced. For the quadratic basis functions, the two spectra only become distinguishable past the 6000Hz frequency, at which range there are no more significant peaks.
